Telescoping tractor boom



Feb. 8, 1949. B, TO ETAL 2,461,433

TELESCOPING TRACTOR BOOM Filed Oct. 1, 1945 5 Sheets-Sheet 2 EORGE B. MEWWW AUTHUR C. MOUL TON ATTEI RN EYE Feb. 8, 1949. s. MOULTON EIAL TELESCOPING TRACTOR BOOM 3 Sheets-Sheet 3 Filed Oct. 1, 1945 ..N.N mm w NLL mw M 5 5 E M Z rm A'ITDRNEYB Patented Feb. 8, 1949 'rnnnscormc 'rnac'roa BOOM George B. Moulton and Arthur- 0. Mouton,

Newfleld, Maine Application October 1, 1945, Serial No. 619,594

3 Claims. 1

The invention relates to a boom and more especially to a telescopic tractor boom.

The primary object of the invention is the provision of a boom of this character, wherein a tractor can be built therewith, and such boom can be extended and contracted for loading and unloading purposes, the extending and contracting being eifected automatically and'is powered from the tractor motor unit.

Another object of the invention is the provision of a boom of this character, wherein it-is one man controlled, and carried by a tractor so that it can be moved from one locality to another with dispatch and ease, the boom being equipped with a hoisting cable operated from a winch driven directly from the power unit of the tractor, the extending and contracting of the boom being manually controlled by the operator of the tractor.

A further object of the invention is the provision of a boom of this character, which is simple in construction, thoroughly reliable and eflicient in operation, strong, durable, possessing a wide range of adjustment, readily and easily adjusted, its lifting cable being driven from the tractor power unit, and inexpensive to manufacture and install.

With these and other objects in view, the invention consists in the features of construction,

. combination and arrangement of parts as willbe hereinafter more fully described, illustrated in the accompanying drawings, which show the preferred embodiment of the invention, and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is an end elevation of the boom constructed in accordance with the invention, as carried by a tractor, the latter being schematically illustrated;

Figure 2 is a view similar to Figure 1, looking toward the opposite end;

Figure 3 is a side view, partly broken away;

Figure 4 is a sectional view taken approxi-' mately on the line 4-4 of Figure 3;

Figure 5 is a sectional view taken approximately onthe line 65 of Figure 4 looking in the direction of the arrows.

Similar reference characters indicate corresponding parts throughout the several views in the drawings.

Referring to the drawings in detail, A designates generally through dotted line illustration a tractor, which is of any approved type, and now in general use, and upon this tractor is carried 2 the boom constituting the present invention and hereinafter described in detail.

The boom comprises fore and aft upwardly divergent swinging truss frames l0 and II, respectively, each being of substantially V'-shaped or U-shaped, and the side members l2 of both frames are swingable on pivots l3, one on each side of the tractor A and these are in opposed alignment with each other, to project outwardly laterally from such tractor, and carried by supporting brackets ll fixed in any suitable manner to-the said tractor, approximately midway of the length thereof.

On the cross heads I! at their centers is located a telescopic boom, which involves a fixed tubiform section l8", secured in any suitable manner to both frames l0 and ii for carriage there;- by, and an extensible section ll, telescopically interfltting the section It, and of tubiform. Thisstay cable I8 is connected directly to the tractor A, as at 20, through bracket arrangement, in order to utilize the entire weight of the tractor in holding the booinfi The' stay cable lilcan be connected to any suitable place on the rear of the tractor A, preferably as far in the rear as possible.

By passing the stay cables l8 through a series of blocks 2|, two being connected to the tractor A and the others mounted on the boom frame,

the tracks of the said tractor can oscillate to any boom. The stay cable I! passes over a sheave 22 on the boom slide, around the block 23 attached to the back of the tractor A, up around the block 24 connected to the tensioning spring 25 and anchored on the back of the said tractor A at 28. The tensioning spring 25 keeps the stay cables tight at all times and compensates for differences between the stay cables due to flexing of the equalizer spring of the tractor.

The forward stay cable It! is attached to a drum 2'! on a gear box 28 and the rear stay cable I9 is attached to a drum 29 located on the opposite side of the gear box 20. These two drums are made the proper size to give approximately the same amount of movement of the boom frame for one revolution of the said drums. This keeps the stay cables nearly tight for any position of theboom, the reminder being taken up by the tension spring.

The drums 21 and II are operated by engaging gears 30 and Ii, respectively, within the gear box 28 by sliding the crank shaft 32 out half-way. Then by disengaging a lock it and turning the crank it to the right or left, the boom can be ad- Justed either up or down, as may be required. The lock It consists of a lock pin 3! extending through the end of the gear box 2|, engaging into holes 88 in the hub 81 of the gear ll. This lock pin 35 is held in position by a spring 39 and is disengaged by the use of a cam 89. By turning the lock handle 40 one quarter of a turn the cam 39 withdraws the lock pin and holds it in proper position.

The extensible section II of the boom is moved by engaging gears ti and 42, respectively, by

sliding the crank shaft 32 way out. This connects the crank 34 of the shaft 12 to the rack 45 on the section II, so that by turning the crank, the section il' can be moved either in or out of the section It, as should be apparent.

The sliding section i1 is held in position by a lock, consisting of a short section of a rack 48, the teeth of which engage the teeth of the rack 45 on the said section i'l. This lock-is held in position by a spring 41. To disengage the look a cam 48 is turned one quarter turn with the handle 49. A small flat area I50 on the cam holds it in the unlocked position.

The boom is of box-like construction with the rack 45 attached to the bottom side, preferably by welding. At the outer end of the boom, a rope block it with a side opening, is attached by a swivel 52 to carry the loading rope S3 in any direction, and this rope 53 is associated with a hoisting winch it in any suitable manner, which winch is upon the rear of the tractor A. The telescoping tractor boom can be operated in any desirable position, lifting any load that will not tip the tractor. Then the tractor can be operated as any type thereof with the boom in closed position.

What is claimed is:

1. A boom of the character described for carriage upon a tractor, comprising fore and aft truss frames swingingly rising from said tractor, telescopically interfitted sections forming an extensible boom and having one section thereof fixed to the frames, a loading rope movably carried by such sections, means for moving one of the sections with respect to the other of said boom, said last mentioned means comprising a rack formed on the lower surface of the last mentioned section, and a gear mounted in a gear box coacting with said rack, said gear box being mounted on the section nxed to-said frames, and means for swinging the frames to selected positions on the tractor. I V

2. A boom of the character described for carriage upon a tractor, comprising fore and aft truss frames swingingly rising from said tractor, telescopically interfitted sections forming an extenslble' boom and having one section thereof fixed to the frames, a loading rope movably carried by such sections, means for moving one of the sections with respect to the other of said boom, said last mentioned means comprising a rack formed on the lower surface of the last mentioned section, and a gear mounted in a gear box coacting with said rack, said gear box being mounted on the section fixed to said frames, means for swinging the frames to selected positions on the tractor and means for holding the frames in adjusted position on the tractor.

3. A boom of the character described for carriage upon a tractor, comprising fore and aft truss frames swingingly rising from said tractor, telescopically interfitted sections forming an extensible boom and having one section thereof fixed to the frames, a loading rope movably carried by such sections, means for moving one of the sections with respect to the other of said boom, said last mentioned means comprising a rack formed on the lower surface of the last mentioned section, and a gear mounted in a gear box coacting with said rack, said gear box being mounted on the section fixed to said frames, means for swinging the frames to selected positions on the tractor, means for holding the frames in adjusted position on the tractor and means for locking the sections in adjusted relation to each other.

GEORGE B. MOULTON. ARTHUR C. MOULTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Witherell Mar. 4, 194:! 

